Socket for incandescent electric lamps.



H. c. WIRT. SOCKET FOR INCANDESCENT ELECTRIC LAMPS.

nrpmurox FILED 0GT.'12',19-10. 1,01 1,544, Patented Dec. 1.2, 1911.

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HERBERT C. WIRT, OF PLYMOUTH, MASSACHUSETTS.

SOCKET FOR INCANDESCENT ELECTRIC LAIVIPS.

Specification of Letters Patent.

' Patented Dec. 1-2, 1911.

means by which the usual thin insulating flexible lining is held in said cap. Heretofore various means for this purpose have been employed, such as indentations or punctures, which produce points of metal extend-1 ing inward around the dome-shaped upper part of the-cap, also an annular groove pro-- duced by forming an outwardly projectingbead around the base of the cap; the latter form was particularly ineffective for the reason that when the thin flexible lining Was inserted in. the cap its peripheral edge usually was too small to fill this annular groove and itwould not be securely held in place but by my improved construction, consisting of an annular bead projecting inward around the base of the dome-shaped upper part of the cap or substantially at the junction of the cylindrical rim and the upper converging portion thereof, the lining for the cap may be readily pushed into the 'cap, its peripheral edgeslipping over the annular bead, and when in lace will be securely held therein. Besi es, this construction gives a neat ornamental finish to the exter1or.

In the drawings which'form a part of this specification, Figure 1 is a side elevation of t e metal cap; Fig. 2 is a diametrical sectional elevation; F1g. 3 is a plan view look- Application filed October 12, 1910. Serial No. 586,803.

ing into the lower end of the cap, with the insulating lining therein; and Fig. 4: is a diametrical sectional elevation of the cap with the lining removed.

Referring to the drawings by designating letters, G is the cap; in Fig. 1 it is illustrated resting upon a shell shown in dotted lines; It is the cylindrical rim of the cap; D, the dome-shaped or converging upper portion; a, the annular inwardly projecting bead; L, the thin insulating lining, provided with the usual central, opening for the introduction of the line wires.

By the sectional view, Fig. 2, it will be observed that the perimeter 7) of the lining L rests upon the annular bead a by which it is held in ptoper position in the dome-part of the cap, and at the same time as the bead has no abrupt or sharp edges or projections the lining may be removed without fracture or in ury. It will be seen, also, especially 1n Fig. 1, that this inwardly projecting bead gives a neat, ornamental to the exterior of the cap.

I claim:

1. In a cap for an incandescent electric lamp socket, provided with a cylindrical rim and a converging-portion beyond the rim, an

inwardly projecting annular head at the unction of the cylindrical and converging portions, which bead is adapted to hold aninsulating lining in the latter portion.

2. In a metallic capfor an incandescent electric lamp socket, means to hold an insulating lining therein, consisting of an inwardly projecting annular bead at the base of the dome-shaped portion of the cap, to engage the circular edge of the lining when it is pressed into the cap.

HERBERT C. WIRT. Witnesses:

FLORENCE A. COLLINS, JOSEPHINE H. RYAN.

five cents each, by addressingthe Commissioner of Patents, Washington, D. G. 

